The coefficient of \[{{x}^{-7}}\] in the expansion of \[{{\left( ax-\frac{1}{b{{x}^{2}}} \right)}^{11}}\] will be [IIT 1967; RPET 1996; Pb. CET 2003]

\[\frac{-462{{a}^{5}}}{{{b}^{6}}}\]

\[\frac{462{{a}^{6}}}{{{b}^{5}}}\]

\[\frac{462{{a}^{5}}}{{{b}^{6}}}\]

\[\frac{-462{{a}^{6}}}{{{b}^{5}}}\]

The coefficient of \[{{x}^{-7}}\] in the expansion of \[{{\left( ax-\f

1.	The coefficient of \[{{x}^{-7}}\] in the expansion of \[{{\left( ax-\frac{1}{b{{x}^{2}}} \right)}^{11}}\] will be [IIT 1967; RPET 1996; Pb. CET 2003]
A.	\[\frac{462{{a}^{6}}}{{{b}^{5}}}\]
B.	\[\frac{462{{a}^{5}}}{{{b}^{6}}}\]
C.	\[\frac{-462{{a}^{5}}}{{{b}^{6}}}\]
D.	\[\frac{-462{{a}^{6}}}{{{b}^{5}}}\]
Answer» C. \[\frac{-462{{a}^{5}}}{{{b}^{6}}}\]

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The coefficient of \[{{x}^{-7}}\] in the expansion of \[{{\left( ax-\frac{1}{b{{x}^{2}}} \right)}^{11}}\] will be [IIT 1967; RPET 1996; Pb. CET 2003]

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